1997 rodeo w/ check engine light

I've had a recurring check engine light. Went to auto zone to have the codes resd, but couldn't determine where to plug in the reader. Any help? V-6 engine

I've had a recurring check engine light. Went to auto zone to have the codes resd, but couldn't determine where to plug in the reader. Any help? V-6 engineIt's right beside the hood latch release under the knee bolster.